see [1]}.
Conversely, if \(\phi \)  is defined on all of \(\mathbb {H}\)  and \(\nabla _\phi \phi \)  is bounded, then \(\phi \)  is \(\lambda \) –intrinsic Lipschitz for some \(0<\lambda <1\)  depending on \(\Vert \nabla _\phi \phi \Vert _\infty \)  [2]}.
